﻿using System;
using System.Net;
using System.IO;
using System.Web.Services.Description;
using System.CodeDom;
using System.CodeDom.Compiler;
using Microsoft.CSharp;

/// <summary>
///InvokeWebService 的摘要说明
/// </summary>
class WebServiceHelper
{

    /// <summary>
    /// 动态调用WebService
    /// </summary>
    /// <param name="url">WebService地址</param>
    /// <param name="methodname">方法名</param>
    /// <param name="args">参数</param>
    /// <returns></returns>
    public static void InvokeWebServiceWithoutResult(string url, string methodname, object[] args)
    {
        WebServiceHelper.invokeWebService(url, null, methodname, false, args);
    }

    /// <summary>
    /// 动态调用WebService
    /// </summary>
    /// <param name="url">WebService地址</param>
    /// <param name="classname">类名</param>
    /// <param name="methodname">方法名</param>
    /// <param name="args">参数</param>
    public static void InvokeWebServiceWithoutResult(string url, string classname, string methodname, object[] args)
    {
        WebServiceHelper.invokeWebService(url, classname, methodname, false, args);
    }

    /// <summary>
    /// 动态调用WebService
    /// </summary>
    /// <param name="url">WebService地址</param>
    /// <param name="methodname">方法名</param>
    /// <param name="args">参数</param>
    /// <returns></returns>
    public static object InvokeWebService(string url, string methodname, object[] args)
    {
        return WebServiceHelper.invokeWebService(url, null, methodname, true, args);
    }

    /// <summary>
    /// 动态调用WebService
    /// </summary>
    /// <param name="url">WebService地址</param>
    /// <param name="classname">类名</param>
    /// <param name="methodname">方法名</param>
    /// <param name="args">参数</param>
    /// <returns></returns>
    public static object InvokeWebService(string url, string classname, string methodname, object[] args)
    {
        return WebServiceHelper.invokeWebService(url, classname, methodname, true, args);
    }

    #region 私有方法
    /// <summary>
    /// 动态调用WebService
    /// </summary>
    /// <param name="url">WebService地址</param>
    /// <param name="classname">类名</param>
    /// <param name="methodname">方法名</param>
    /// <param name="methodname">是否有返回值</param>
    /// <param name="args">参数</param>
    /// <returns></returns>
    private static object invokeWebService(string url, string classname, string methodname, bool hasResult, object[] args)
    {
        string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
        if ((classname == null) || (classname == ""))
        {
            classname = WebServiceHelper.GetWsClassName(url);
        }

        try
        {
            //获取WSDL
            WebClient wc = new WebClient();
            Stream stream = wc.OpenRead(url + "?WSDL");
            ServiceDescription sd = ServiceDescription.Read(stream);
            ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
            sdi.AddServiceDescription(sd, "", "");
            CodeNamespace cn = new CodeNamespace(@namespace);

            //生成客户端代理类代码
            CodeCompileUnit ccu = new CodeCompileUnit();
            ccu.Namespaces.Add(cn);
            sdi.Import(cn, ccu);
            CSharpCodeProvider csc = new CSharpCodeProvider();

            //设定编译参数
            CompilerParameters cplist = new CompilerParameters();
            cplist.GenerateExecutable = false;
            cplist.GenerateInMemory = true;
            cplist.ReferencedAssemblies.Add("System.dll");
            cplist.ReferencedAssemblies.Add("System.XML.dll");
            cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
            cplist.ReferencedAssemblies.Add("System.Data.dll");

            //编译代理类
            CompilerResults cr = csc.CompileAssemblyFromDom(cplist, ccu);
            if (cr.Errors.HasErrors)
            {
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)
                {
                    sb.Append(ce.ToString());
                    sb.Append(System.Environment.NewLine);
                }
                throw new Exception(sb.ToString());
            }

            //生成代理实例，并调用方法
            System.Reflection.Assembly assembly = cr.CompiledAssembly;
            Type t = assembly.GetType(@namespace + "." + classname, true, true);
            object obj = Activator.CreateInstance(t);
            System.Reflection.MethodInfo mi = t.GetMethod(methodname);

            if (hasResult)
                return mi.Invoke(obj, args);
            else
            {
                mi.Invoke(obj, args);
                return null;
            }
        }
        catch (Exception ex)
        {
            throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
        }
    }

    /// <summary>
    /// 防止被实例化
    /// </summary>
    private WebServiceHelper()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }


    /// <summary>
    /// 获取WS服务的类名
    /// </summary>
    /// <param name="wsUrl">WS服务的地址</param>
    /// <returns></returns>
    private static string GetWsClassName(string wsUrl)
    {
        string[] parts = wsUrl.Split('/');
        string[] pps = parts[parts.Length - 1].Split('.');

        return pps[0];
    }
    #endregion
}
